Power management device

1. A power management device comprising: a first switch provided between a power source and a load; a converter connected to the first switch in parallel and configured to convert a voltage and a current that are received from the power source; a voltage detector configured to detect the voltage from the power source; a current detector configured to detect the current from the power source; and a processor configured to: control power from the power source to be supplied to the load through the first switch by turning on the first switch in an echo compensation mode, monitor power quality based on the detected current and the detected voltage, perform, based on a determination that the power quality has been abnormal according to the monitored power quality, (i) compensation control through the converter in a turned-on state of the first switch or (ii) control of the power from the power source to be supplied to the load through the converter by turning off the first switch, monitor harmonics, a power factor, and a voltage unbalance based on the detected current and the detected voltage, and control the converter based on the monitored harmonics, power factor, and voltage unbalance.

2. The power management device of claim 1, further comprising: a second switch connected between the power source and the converter; and a third switch connected between the load and the converter, wherein the converter includes (i) a first converter connected to the second switch and configured to convert the voltage and the current from the power source into a DC voltage and a DC current, respectively and (ii) a second converter provided between the first converter and the third switch and configured to convert the DC voltage and the DC current converted by the first converter into an AC voltage and an AC current, respectively.

3. The power management device of claim 2, wherein the processor is configured to: control the power from the power source to be supplied to the load through the converter by turning off the first switch in an online compensation mode, monitor the power quality based on the detected current and the detected voltage in the online compensation mode, and perform the compensation control for the power quality based on the monitored power quality.

4. The power management device of claim 3, wherein the processor is configured to, based on a determination that a fault of at least one of the second and third switches or the first and second converters has occurred in the online compensation mode, control the power from the power source to be supplied to the load through the first switch by turning on the first switch.

5. The power management device of claim 2, wherein the processor is configured to: monitor a voltage sag, a voltage swell, the voltage unbalance, the harmonics, and the power factor upon monitoring the power quality, perform, based on a determination that the monitored power quality with respect to at least one of the harmonics, the voltage unbalance, or the power factor has been abnormal in the echo compensation mode, the compensation control through the first and second converters by turning on the second and third switches in the turned-on state of the first switch, and control, based on a determination that the monitored power quality with respect to the voltage sag or the voltage swell has been abnormal, the power from the power source to be supplied to the load through the first and second converters by turning off the first switch and turning on the second and third switches.

6. The power management device of claim 5, further comprising a DC link provided between the first converter and the second converter and including a capacitor, wherein the processor is configured to: control, based on the abnormality of the power quality being the voltage sag, discharging of the capacitor, and control, based on the abnormality of the power quality being the voltage swell, charging of the capacitor.

7. The power management device of claim 2, further comprising: a fourth switch connected to an energy storage system including a battery; and a third converter connected to the fourth switch, the first converter, and the second converter, wherein the processor is configured to: control, based on a charged amount of the battery being less than a reference charged amount, the power from the power source to be supplied to the battery through the first converter and the third converter by turning on the fourth switch, and control, based on a current electric fee being a maximum electric fee, power from the battery to be supplied to the load through the third converter and the second converter by turning on the fourth switch.

8. The power management device of claim 7, wherein the processor is configured to: control, based on the abnormality of the power quality being a voltage sag, the power from the battery to be supplied to the second converter by turning on the fourth switch, and control, based on the abnormality of the power quality being a voltage swell, power from the first converter to be supplied to the battery by turning on the fourth switch.

9. The power management device of claim 2, further comprising: a first filter provided between the power source and the first converter and including an inductor-capacitor-inductor (LCL) filter; and a second filter that is provided between the second converter and the load and that includes an inductor-capacitor (LC) filter.

10. A power management device comprising: an input device; a first switch provided between a power source and a load; a voltage detector configured to detect the voltage from the power source; a current detector configured to detect the current from the power source; a converter connected to the first switch in parallel and configured to convert a voltage and a current that are received from the power source; and a processor configured to: control, based on a compensation mode received through the input device being an echo compensation mode, power from the power source to be supplied to the load through the first switch by turning on the first switch on, control, based on the compensation mode received through the input device being an online compensation mode, the power from the power source to be supplied to the load through the converter by turning off the first switch, monitor harmonics, a power factor, and a voltage unbalance based on the detected current and the detected voltage, and control the converter based on the monitored harmonics, power factor, and voltage unbalance.

11. The power management device of claim 10, wherein the processor is configured to: monitor power quality based on the detected current and the detected voltage in the echo compensation mode, and perform, based on a determination that the power quality has been abnormal according to the monitored power quality, (i) compensation control through the converter in a turned-on state of the first switch or (ii) control of the power from the power source to be supplied to the load through the converter by turning off the first switch.

12. The power management device of claim 11, further comprising: a second switch provided between the power source and the converter; a third switch provided between the converter and the load; a first filter connected to the second switch and including an inductor-capacitor-inductor (LCL) filter; and a second filter that is connected to the third switch and that includes an inductor-capacitor (LC) filter, wherein the converter includes (i) a first converter connected to the second switch and configured to convert the voltage and the current from the power source into a DC voltage and a DC current, respectively and (ii) a second converter provided between the first converter and the third switch and configured to convert the DC voltage and the DC current converted by the first converter into an AC voltage and an AC current, respectively.

13. The power management device of claim 12, wherein the processor is configured to monitor the power quality based on the detected current and the detected voltage and perform the compensation control based on the monitored power quality.

14. The power management device of claim 13, wherein the processor is configured to, based on a determination that at least one of the second and third switches or the first and second converters is in a fault state in the online compensation mode, control the power from the power source to be supplied to the load through the first switch by turning on the first switch.

15. The power management device of claim 12, further comprising: a fourth switch connected to an energy storage system including a battery; and a third converter connected to the fourth switch, the first converter, and the second converter, wherein the processor is configured to: control, based on a charged amount of the battery being less than a reference charged amount, the power from the power source to be supplied to the battery through the first converter and the third converter by turning on the fourth switch, and control, based on a current electric fee being a maximum electric fee, power from the battery to be supplied to the load through the third converter and the second converter by turning on the fourth switch.

16. The power management device of claim 15, wherein the processor is configured to: control, based on the abnormality of the power quality being a voltage sag, the power from the battery to be supplied to the second converter by turning on the fourth switch, and control, based on the abnormality of the power quality being a voltage swell, power from the first converter to be supplied to the battery by turning on the fourth switch.

17. A power management device comprising: a converter connected to a power source and configured to convert a voltage and a current that are received from the power source; a switch connected to an energy storage system including a battery; a voltage detector configured to detect the voltage from the power source; a current detector configured to detect the current from the power source; and a processor configured to: determine whether a state of the power input to the power management device is a voltage sag state or a voltage swell state based on the detected voltage, control, based on a determination that the state of the power input to the power management device is the voltage sag state, power from the battery to be supplied to the converter by turning on the switch, control, based on a determination that the state of the power input to the power management device being the voltage swell state, power from the power source to be supplied to the battery through the converter by turning on the switch, monitor harmonics, a power factor, and a voltage unbalance based on the detected current and the detected voltage, and control the converter based on the monitored harmonics, power factor, and voltage unbalance.

18. The power management device of claim 17, wherein the processor is configured to: control, based on a charged amount of the battery being less than a reference charged amount, the power from the power source to be supplied to the battery through the converter by turning on the switch, and control, based on a current electric fee being a maximum electric fee, the power from the battery to be supplied to the converter by turning on the switch.

19. The power management device of claim 17, further comprising: a first switch provided between the power source and a load and connected to the converter in parallel; a first filter provided between the power source and the converter and including an inductor-capacitor-inductor (LCL) filter; a second filter that is provided between the converter and the load and that includes an inductor-capacitor (LC) filter; a second switch provided between the first filter and the converter; and a third switch provided between the second filter and the load, wherein the power from the power source is supplied to the load through the first switch based on the first switch being turned on, and the power from the power source is supplied to the load through a path connecting the second switch, the first filter, the converter, the second filter, and the third switch based on the first switch being turned off.